One of our Tumblr followers requested a breakdown of how to make a yapp foreedge so I created a step by step breakdown of the yapp model I made out of office supplies. You can make this any size you want. I usually try to keep my turn ins between 1/2” and 3/4” wide. Note that if this was an actual case, this piece of card would be more than twice as long so as to completely cover a book.
To begin your yapp paper case turn in the head and the tail. Adding a score line (an indented line marking where you want to fold) will help you turn in.
Next determine where you want your foreedge and fold.
Then decide how tall/wide you would like your yapp to be and fold.
These fold lines will help you know where to trim. To cut down on bulk, trim out the corners. The shaded square uses the foreedge turn in and the head and tail turn ins to determine how much to trim.
You then want to cut out a triangle to make the tabs you will tuck in to secure the yapp. Cut along the yapp fold a little bit and then move out to the edge of the paper.
Fold everything back up. You will now want to mark where your tabs land on the head and tail turn ins so you can cut a slit for the tabs to slide into.
Fold it back out and turn the paper over. Do not cut while everything is still folded! (You will cut through your cover if you do!)
Refold again and slip your tabs into place.
Voila! You have just made a yapp!